Doepfer MCV4 Midi CV/Gate Interface - Manual (Page 6)

MCV4 User's Guide - Page 5
the table above as in this case the program changes of your device range from 0...127
instead of 1...128. For some devices (especially software sequencers) the type of program
change numbering can be selected. In this case you should use the 1...128 range to agree
with the numbers in the table above.
The program change messages must be sent on the MCV4 MIDI channel (see remark 1).
(2) Velocity on/off
These program change messages are used to select whether the note on velocity affects the
control voltages CV3 resp. CV4. If velocity is "off" only volume (CV3) resp. the free chosen
controller (CV4) is used to generate the control voltage. If velocity is "on" the volume or
controller value is multiplied with the note on velocity, i.e. the CV value changes with every
new note event as the velocity of the note event is used to calculate the control voltage
together the volume message (CV3) resp. the free controller (CV4).
(3) Retrigger on/off
With this parameter you may select whether a new gate/trigger pulse is generated when
playing LEGATO (i.e. playing a new note on the keyboard while the key of the former note is
still pressed). The factory default setting is retrigger off. Additionally the MIDI controllers
LEGATO (controller #68) and SUSTAIN (controller #64) affect the gate output in the usual
manner.
(4) Trigger polarity
If voltage gate is selected with the jumper inside the MCV4 you may switch between normal
gate (i.e. +5V/+U if key is pressed and 0V if key is released) and inverted gate (i.e. 0V if key
is pressed and +5V/+U if key is released). In case of S-Trigger (jumper removed) the
circumstances are reverse. If the behaviour of your synthesizer is opposite as desired (i.e.
the sound appears if the key is released on your MIDI keyboard) you have to change this
parameter with program change #7 or #8 in the learn mode. The factory default setting is
normal gate.
(5) Velocity mode
This parameter defines whether the velocity resolution 127 steps (as in MIDI usual) or only 2
steps. The 2-step-mode is similiar to the accent used in some vintage equipment (e.g.
TB303, TR808) and could make sense to simulate one of these devices.
The velocity threshold value is 100: incoming velocity values of 100 or more are converted
into a fixed velocity value 127, incoming velocity values less than 100 are converted into a
fixed velocity value 64.
(6) CV1 key assign modes
These program change messages adjust the type of assign modes for CV1. If highest note is
selected the highest key pressed on the MIDI keyboard is used to calculated CV1 if more
than one key is pressed down. In the last note mode always the last note (chronological) is
taken for CV1. Reference note means that only the reference note is accepted. This feature
is useful if you want to trigger different devices on the same MIDI channel using two or more
MCV4. In this case you have to set the reference notes for the MCV4's to different values.
Stack note means that the MCV4 is filtering out the note event that is used by the MCV4 to
generate CV1. The note event in question is not transmitted to the MIDI Thru output. Stack
mode is used to control more than one synthesizer on one MIDI channel and enables
polyphonic control of different synthesizers on the same MIDI channel.
(7) CV Characteristics
With programm change #19 and #20 in learn mode you may select between V/Octave and
Hz/V characteristics for the CV1 output.
V/Octave is used by most of the synthesizer manufacturers (Moog, ARP, Oberheim, roland,
Sequential Circuits, EMS, Doepfer). When V/Octave is chosen incoming MIDI pitch bend
events affect the CV1 voltage. If Hz/V is selected incoming MIDI pitch bend events do not
affect the CV 1 putput. Because of the non linear voltage range mode the resolution is very
poor in the lower voltage range compared to the V/Octave. So the Hz/V mode should be